HOMOLOGICAL RELATIONS, &C. 229 



XL 



HOMOLOGICAL RELATIONS OF THE PARTS 

 CONCERNED IN REPRODUCTION. 



1 . IN order to complete our survey of the process of re- 

 production, it remains to offer some remarks on the cor- 

 respondences or homological relations of the structures con- 

 cerned in it, with reference to differences both of sex and 

 species, and by way of making subsequent enquiries more 

 intelligible, a few words may be premised concerning the 

 principal modifications and general nature of the ultimate 

 reproductive particles. 



Having already adverted to the development of these 

 corpuscules in both Kingdoms of Nature, the following 

 summary of their principal modifications will be sufficient 

 here, in connection with the remarks which have to be made 

 on their essential nature, and on their homological relations. 

 The Spermatic Corpuscules in the Vegetable Kingdom 

 are 



In the Protophyta, merely the condensed endo- 

 chrome of certain cells, and undistinguishable 

 from the germinal element. 



In certain Algae (Floridese), Lichens and Fungi, 

 ellipsoidal or cylindrical motionless bodies, 

 without cilia (microgonidia, spermatia, &c.) 

 In the Algae generally, ciliated ovoid bodies like 



minute zoospores ( anther ozoids, phytozoa). 

 In the Characeae, and in the higher Cryptogamia 

 generally, (Hepaticae, Mosses, Ferns, Equise- 

 tacese, Lycopodiaceae, and Marsileaceae), fila- 



