[dø] 
J 
XIV. On the Agamic Reproduction and Morphology of Aphis. —Part I. By Tuomas 
 H. Huxzey, F.R.S., Professor of Natural History, Government School of Mines. 
: Communicated by G. Busk, F.R.S., F.L.S. 
Read November 5th, 1857. 
$ 1. Preliminary Remarks. 
$ 2. The Viviparous Female, and the Development of the Pseudova. 
$ 3. The Oviparous Female, her Reproductive Organs and Ova. 
$ 4. The Development of the Pseudovarium in the Viviparous Female. 
$ 5. Summary; and Comparison of Germs and Ova. E 
$ 6. Hypothetical Explanations of Agamogenesis. x 
$ 7. Classification of the Phenomena of Agamogenesis. 
$ 1. Preliminary Remarks. 
“J'AI souvent pensé qu’on pourrait, dans l'histoire des sciences, désigner les époques par 
les principales découvertes. Par exemple, 1665 seroit l’époque de la Gravitation; 1789, 
l'époque de la méthode naturelle en Botanique; et, si parva licet componere magnis, les 
années 1740 à 1750 seroient l’époque des Pucerons*.” e ot EF 
Without, perhaps, being disposed to go so far as the enthusiastic French investigator - 
of Plant-lice, no physiologist will deny that the experiments conceived and attempted by 
Réaumur, but first successfully carried out by Bonnet, established faets of the highest 
importance, and raised questions which still disturb the very foundation of his science. 
But what were these great facts, established by Bonnet and his successors or contem- 
| poraries, Trembley, Lyonet, Degeer, Kyber, and others? | | 
If the moderns paid due attention to the labours of their predecessors, an accurate 
answer to this question should be found in every accredited text-book on zoology. But 
it will be found, on the contrary, that important errors have crept into the current con- 
ceptions respecting the reproductive processes and mode of life of the Aphides, and that 
at.the present day the state of general information as to the natural history of these 
singular creatures is in many respects rather behind, than in advance of, that of the past 
generation. ie : 
Bonnet's wonderfully patient and laborious researchest proved, beyond all doubt, 
exual influence; 2ndly, that the 
Ist, that the viviparous Aphis may propagate without s i 
brood thus produced nray give rise to young in the same way ; that these may repeat this 
asexual prolification; and so on for as many as ten broods; 3rdly, that the viviparous 
Aphides and their brood may be either winged or apterous; 4thly, that, under snp 
conditions, winged or wingless males appear and copulate with ae females, which, 
in thé instances observed by Bonnet, were wingless. ME j b ü 
These are the statements put forth by Bonnet on the evidence of direct observation 
à i * ité d'Insectologie, 1745. 
* Duvau, Mém. du Muséum, xiii. 1825. $ Fre d = ogie, 
= 
