Geology and Natural History. 395 
a , occupies two or f the earlier page re) 
Thwaites is attributed the origination of the view that conjugation 
Is sexual reproduction in m eneralized é 
tion of the spore in the cells of one of the wholly similar parents, 
instead of between the two as in Desmidiew and Diatomacee, 
but such adumbration is rather “apparent” than real. It was 
Thwaites who, in 1847, discovered conjugation in Diatomacee. 
Morren had long before discovered it in Desmidiece ( Closterium). 
The cilia of antherozoids were discovered in 1840, by Thuret, 
whose recent death, in the midst of important work, i 
may well deplore. In 1852 Thuret first obtained actual fertiliza- 
22. Monographie der Juncaceen vom Cap, bearbeitet vom 
BucuEna en, 1875. 8vo.—This monograph of 
the Juncacee of the Cape of Good Hope, by Dr. Buchenau, is a 
Separate issue from the Abhandlungen des naturwissenschafilichen 
ereins zu Bremen, Band iv, Heft 4, pp. 393-512, and is illus- 
trated by 7 quarto plates, filled with details, devoted to the 
illustration of 32 species, chiefly of the genus fg aoe At the 
close is g 
Juncacee, from the Supplementum Plantarum of the younger 
Linnzeus down to Steudel’s Synopsis of Giunacec. _ Also name 
are given to the numbers in Drége’s distributed collection. A. 6. 
“ENNEY, 
