Second , the development of workers / sexuals . He begins with saying that an ant develops in this sequence : eggs to larvae to nymphs / pupae ( with or without cocoon ! ) to adult workers / sexuals and that the place of the larvae and pupae in the nest are regulated by temperature and humidity ( Swammerdam , 1752 , also observed that ants relocate their young in the nest , depending on the temperature ! ) . And he also says that by disturbances the workers bring the larvae and pupae in security !
But this is not yet finished . He gives descriptions of ( followed by some other observations by him . ) :
- The eggs : They swell in six days six times in diameter . He doesn't know how this happens but gives a few hypothesizes how it could be .
- The larvae in the eggs before they come out of them : There is also liquid in those eggs that serve to feed the larvae .
- The hatched larvae : De Ráumur was the first to describe the feeding of the larvae by liquid and not solid food ( earlier than Gould , 1747 ! ) . He follows by saying that the workers also licked the larvae . The duration of the larval stadium he didn't know but he knew the larvae moulted a few times ( he found their skins ! ) and supposed that it was about fourteen days ( but this was to short ! ) .
- The pupae of workers , females and males and the changes in coloration they go through : In some of the species , larvae spin cocoons , others not . Those larvae that spin cocoons stay for two days in it before they change into pupae . De Ráumur gives a detailed account of the spinning of the cocoon and that the duration for making it is around 29 hours . But then , he gives , as the first entomologist ever , the next observations : For starting the cocoon , the ant-larvae need solid bodies , like particles of wood , to glue the first treads on . When the cocoon is finished , the workers remove the solid particles ! De Ráumur doesn't know how long the pupal stage lasts , but the callow ants escape from the cocoons on their own . Since a long time , it is believed that De Geer , 1771 , was the first to see that the workers assist the callows to escape from the cocoons by opening them , but the first one to witness this was Lyonet in December 1743 , followed by Gould in 1747 .
Carrying of workers .
When studying the disturbance of Formica pratensis-nests ( pp. 101-105 in the original manuscript , pp. 190-194 in the translation and note # 96 on page 251 . ) , de Réaumur observed that some Formica-workers transported some rounded granules . When looking closer , he saw that they carried another worker ant . Bonnet was the first to observe this kind of behavior in Leptothorax ( and later on in Formica . ) in 1739 and published it in 1745 but he interpreted this behavior wrongly ( as part of hostility or irritation ! ) . De Réaumur however got it OK ! He describes that both ants had grasped one of the mandibles of the other , the carried ant brings its gaster under its thorax and fold up his legs . He also describes how an ant asks to be carried and how the other can refuse this to do . The carried ants are mostly workers but possibly sometimes a male !
Notes on Ants .
Now follow a few observations in the " Notes on Ants " !
- De Réaumur describes in short the difference between larvae of workers on one side and larvae of queens / males on the other side . He reports that the workers lick the larvae and that they relocate the larvae depending on the humidity of the chambers in which they are placed ( pp. 113-114 , pp. 202-203 and note # 116 on p. 256 . ) .
- De Réaumur describes an experiment in which he relocates larvae from one colony to another and that the workers of the last colony accept these larvae ( pp. 115-116 , pp. 204-205 and notes # 117-119 on p. 256 . ) .
- De Réaumur reports about an experiment he conducted about colony foundation in ants . He placed two queens together with four workers . The deälated queen carried workers like described before ( pp. 118-119 and p. 208 . ) .
- He describes how ants pass liquid food from one ant to the other : " Les fourmis qui se rencontrent se donnent a manger . L'une presente sa langue qui est lechee par celle de l'autre " ( p. 122 . ) , " Ants , when they meet , feed one another ; one of them presents her tongue , which is licked by that of the other " ( p. 211 . ) . Wheeler , in his note # 138 on p. 259 , says " This seems to be the first description of the method of mutual feeding among ants " .
Some other things et al.
- In this work and in the third and fourth volumes of the " Mémoires pour servir à l'Histoire des Insectes " , de Réaumur describes the relation between plant-lice / scale-insects and ants ( he was the first to discover this ! ) . He says that the ants lap up the sugary liquid produced by these insects . He makes one mistake , he says that this liquid in plant-lice is excluded by the anus ( correct ! ) and the two cornicles ( wrong , they produce a defensive substance ! ) . In scale-insects he was not sure about the source ( the same as in the plant-lice ! ) . See pp. 64-66 , pp. 152-154 and notes # 32 and 34 on pp. 231-232 .
- In the discussion about the formation of polydomous colonies ( pp. 96-103 , pp. 186-192 . ) , de Réaumur gives some observations made by three others , Jean Baptiste du Tertre , Jean Baptiste Labat and Maria Sibylla Merian . They published some info about ants in Martinique ( the first two . ) and Surinam ( the last one ! ) . Now , these are a mix of observations , attributed to one ant , that are now allocated to different species and subfamilies ( on one side Eciton burchelli , E. hamatum or Labidus praedator belonging in the Ecitoninae and on the other side Atta sp. , a Myrmicine ) . The ants have fixed nests . The forays of these ants are explained as swarms that need a few days to find their new , fixed lodging . They cut leaves with their long mandibles . These parts of the leaves are used as larval food . The ants form living bridges between objects to far apart . But de Réaumur is very doubtful about all this ( see pp. 97-99 , pp. 186-188 and notes # 85-91 on pp. 250-251 . ) !!!
- In note # 37 , Wheeler describes the invasion of different islands by " Formica omnivora Linn. 1767 ( Myrmica omnivora Latr. ) " and " Formica saccharivora Linn. 1767 " . The first one ( 1 ) is originally described as " Formica domestica omnivora Linn. 1767 " and is now determined as Solenopsis geminata Fabr. The second is based on " Formica minima saccharivora Brown " ( 2 ) and " magnitudo Formica caespitum " ( 3 ) . ( 2 ) is now determined as Tapinoma melanocephalum and ( 3 ) as Paratrechina longicornis Latr. In some publications ( 1 ) and ( 3 ) are inter-changed with the other explanation causing some big confusions ! This note is to be found on pp. 232-239 ( almost 7 pages ! ) .
The End : A Myrmecological Time Machine !
It is clear the Reaumur was far ahead of his time in his understanding of ants and in the methods to study them . No doubt , this must be the reason why W. M. Wheeler felt compelled to translate this manuscript . It is wonderful to have these glimmerings from the dawn of modern myrmecology .
René Antoine Ferchault de Réaumur was the first modern entomologist that studied ants ( among other insects . ) . This history about ants was never published because he started a discussion with an other big zoölogist of that time , Buffon . Buffon had so much power that he decided or something would be published or not . Unlucky for us , Buffon decided against the publication . The manuscript wasn't know for so long and even now , most myrmecologists don't know it . I'm very happy W. M. Wheeler published it !
Hope you all liked this little trip back in time ! I did , so .....