44 PLANT PHYSIOLOGY 



are 3 feet high, for convenience in working standing, and have 

 capacious cupboards beneath for storage of the larger glass- 

 ware, etc. The apparatus cases, taking the larger and most 

 valuable pieces, have glass doors, while beneath them are many 

 drawers (each with a check block to prevent disaster if pulled 

 too far out) for the innumerable smaller articles needed in the 

 laboratory. There are special cases for chemicals and for books, 

 and another, fixed against a brick wall without contact with 

 the floor, for balances. An important table is the tool-table; 

 it is 3 feet high and has abundant drawers beneath. For the 

 storage of larger apparatus, I have utilized the loft of the labora- 

 tory, which is reached by a balanced dropping stairway built 

 into the ceiling of the laboratory itself. Such a laboratory, with 

 its furniture, would cost at present prices some $1500 or over. 

 As thus planned the laboratory may seem to make too little 

 provision for work in physiological chemistry. But I think 

 that, on the one hand, it does afford, in conjunction with the 

 gas and water room, facilities for all the chemistry which natu- 

 rally belongs in connection with a college course in physiology 

 and in simpler research, while, on the other hand, advanced 

 work in physiological chemistry hardly needs to be done in 

 connection with a greenhouse, but can best be carried on in a 

 properly equipped chemical laboratory. In any case such work 

 must at least be done in a separate room, which could be added 

 as an ell of the laboratory. 



4. APPARATUS AND MATERIALS FOR PLANT 

 PHYSIOLOGY. 



In a general way, according to the idea dominant in its con- 

 struction, apparatus for Plant Physiology may be classified into 

 four kinds, though there are many combinations and intermedi- 

 ate gradations. These kinds are: 



(i) Precision Apparatus, made for research, in which the 

 best possible is the only profitable kind. As a rule it cannot 

 be purchased, but must be made to order at large cost by the 

 most expert workmen. 



