ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 



199 



.acked-up until the am a .taud. <^l^j:^^ ^VS^!- 

 aside to permit of tbe -^"^a 'on of the a al^^^^^^ 



observation of the axis-esit m tj^^ ^J,^,'^ ;;'°"| The larger of these 



hemispherical lenses '^f "^P'^Y .«,^f .^ ^^ 'Xoil or such-like) ma 

 can be centrally cemented or. (with thick cedai ou, 



Fig. 11. 



special mount under t,e glass s.^^^ 



rs rw ™" f"cf ^ood ^^^^^:z^'^ 

 ;=rt::it^Krdrde^^^^^^^^^^^ 



