222 ANATOMY. 



is significantly less, and is indeed limited almost to the mere enlarge- 

 ment of the parts with their retained relative proportions, the change 

 also of the exterior form almost entirely disappear, and the whole 

 metamorphosis be restricted to a mere increase of size ? Truly both 

 phenomena are dependent upon the same law, neither eventually con- 

 ditionates the other, but must proceed from the similar results of one 

 cause, which evidently lies deeply concealed in the mode of develop- 

 ment of the Articulata in general, so that where the one displays 

 itself the other must also be present and both synchronical, neither 

 the latter before the former nor the former before the latter. 



IV. CONFORMITY OF THE FEMALE AND MALE SEXUAL ORGANS. 



154. 



At their origin both kinds of sexual organs, as we have seen above, 

 appear under the same form. This same conformity, displayed at the 

 origin of the internal parts, is also subsequently verified in their 

 fully developed state. This law we laid down at first ( 131), 

 for both systems have the same object, viz. the elaboration of the 

 productive fluid. In the female it is the OVARIES where this fluid 

 is prepared, and in the male we call the same organ the TESTES. 

 Very similar ducts originate from these organs, and afterwards unite 

 and conduct by a single narrower canal their contents outwards. This 

 conformity of importance in the internal parts is still more strongly 

 proved by their forms frequently agreeing. Long cylindrical testes 

 correspond with long ovaries filled with the germs of eggs ( Libc Hulce); 

 ramose bunched testes with similarly formed fasciculated ovaries 

 (Locusta, Gryllotalpa ) ; compound, radiating, and united testes with 

 similar radiating or twirling ovaries (Lamellicornici) ; indeed, some- 

 times the number of the single bodies in the testes agrees with the 

 number of the egg tubes (Meloloniha, Trichitts). It is very natural 

 that the appendages should be differently formed, for their function 

 is different ; for example, the spermatheca of the female organs must 

 necessarily be wanting in the male, for they receive no sperm, but 

 only impart it : consequently the reciprocal conformity of the internal 

 organs is so evident, that it is difficult to doubt it ; but this is not 

 the case with the exterior organs. In these no endeavour has yet 

 been made to trace the parts of the one in the other sex. But if 

 the descriptions be compared which we have given of the male and 



