DR. SCHACHT, (W THE MICROSCOPE. 



221 



Fig. 18. 



Amongst the new material in this edition are three chapters 

 on the embryogeny of the Coniferse, taken from Dr. Schacht's 

 recent work, entitled " Beitrage zur Anatomie und Physiologic 

 der Gewachse." From these chapters we extract the follow- 

 ing remarks on the pollen of Conlferae : — 



Fig. 109 represents a young pollen-grain of Abies pectinata seen in 

 water, and fig. 110 a somewhat older i»llen-grain, also seen in water, 

 where (.r) is the place of the thin spot in the cuticle. 



Fig. Ill represents a mother-cell of Abies pectinata with four young 

 pollen-grains. At the beginning of May the pollen-grains of Picea vul- 

 garis, if placed in water upon the stage of the microscope, frequently 



