and Laboratory Methods. 



1831 



assured, was gained only after the persistent vigilance and oversight which he 

 personally gave it. 



The structure stands in the rear of the main laboratory building of the Agri- 

 cultural School, and on the border of the garden which contains a large collec- 

 tion of economic plants, and which was made famous by the researches of Profes- 

 sor Friedrich Koernicke upon the varieties of the grains. A part of this garden 

 appears in the foreground of our illustration, Fig. 1, in which the northerly ele- 

 vation of the building appears, showing the glass roof and wall of the main 

 laboratory for research in plant physiology. In the southerly elevation, shown 

 in Fig. '2, the ventilating windows of this laboratory are to be seen, while to the 



Fig. 4. 



left are the external details of a unique feature of the plant, the terrarium or 

 " Wurzeltunnel," as it is called upon the ground, to be described beyond. 



The total length of the building is 20.26 meters, with a depth of 8.S8 meters. 

 Interiorly it is broken up into two series of rooms (see Fig. S) which we pass 

 on to examine in turn. Under the guidance of Professor Noll, we should prob- 

 ably enter the room for microscopy, at the northeast corner, occupied by him as 

 an office. Here we find a cupboard stocked with the more delicate instruments 

 of precision for physiological work and a small but efficient working collection 

 of physiological books, beginning with the earliest classics. 



Passing into the large, glass roofed laboratory, we find ourselves in a splen- 

 didly equipped place, as the reader may judge by examining the interior views, 

 Figs. 3 and 4. Along the open side of this laboratory are broad cement tables, 

 so constructed as to be interchangeable from glass topped tables to cement cul- 



