LABORATORY APPARATUS IN VEGETABLE 
PHYSIOLOGY. 
J.C. ARTHUR 
(WITH PLATES XXIV AND XXV) 
In the development of the laboratory methods in any depart- 
ment of science a need arises for convenient pieces of apparatus 
of special construction, and also of new adaptations of apparatus 
already on the market. It takes some time for the need and the 
supply to become adjusted, and suggestions and information in 
the earlier stages or days of development are particularly help- 
ful. It is with a desire to contribute to this demand that the 
following descriptions of apparatus for work in vegetable phys- 
logy are given.! The several pieces have been devised in the 
laboratory of Purdue University to supply the requirements of 
the classes in physiology. 
Auxanometer.—The main features of this apparatus were 
Worked out by Miss Katharine E. Golden, while assistant in the 
laboratory in 1889-93, aided somewhat in the preliminary con- 
Sttuction by her brother, Professor Michael J. Golden, of the 
Mechanical Department of Purdue University. Minor changes 
M perfecting it have been made as they occurred to those who 
Wsed it, and especially by Mr. C. W. Meggenhofen, an unusually 
Menious and painstaking mechanic, who for two years gave 
Pest efforts to the construction of apparatus for this labora- 
sand is still giving some time to it. He is to be credited also 
‘@ much of the successful detail in other apparatus to be 
tibed, especially of the centrifuge. . 
oS : the apparatus here described in detail was sean? gee Ee 
in the ... see . hog Sas 1E: . — i er ee generally dis- 
tributed, and in of Indiana Academy of scence for I sie os apeues oot 4 
er escriptive circular and price-list of physiolog 
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