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1904] BRIEFER ARTICLES 145 
MANN later, in his Morphological Studies, I and H, did not strictly adhere 
to this view, and that he even began to doubt the basis of the mechanical 
theory of leaf position. To him, however, belongs the honor of having 
immensely advanced botanical morphology by means of a wealth of single 
observations, at a period when this branch of science elicited nowhere else 
the interest necessary to produce results. 
When we review the life-work of SCHUMANN we find ourselves con- 
fronted by a problem. How did a man to whom every day brought new 
professional duties still find time to occupy himself so fully with scientific 
work? The solution is to be found in his creative impulse, in his gift of 
easy comprehension, in his powers of clear expression, and in his con- 
scientious desire to crowd into his daily task the full force of all his intel- 
lectual activities. 
The honors conferred upon SCHUMANN were not in proportion to his 
scientific importance or his distinguished gifts as a teacher. He was not 
made unhappy by this, but contented himself with the recognition of his 
colleagues, and found abundant compensation in the love and veneration 
everywhere paid him for his human qualities, his bright and cheerful 
nature, his courtesy, and his never-failing willingness to help.—Translated 
by J. PERKins. 
A CORRECTION. 
IN THE June issue of the BoTaNicAL GAzETTE, Mr. PLOWMAN pub- 
lishes an article on ‘The celloidin method with hard tissues,” stating that 
it has been “‘developed and perfected by Dr. E. C. JEFFREY,” and that it 
“has been incompletely described at second and third hand elsewhere,” 
in this connection calling attention to my book on Methods in plant histol- 
ogy. The collodion method was ‘published in 1879, the celloidin method 
in 1882, and for nearly two decades both methods have been matters of 
text-book knowledge. Since I have used celloidin very little, except 
for woody tissues, I have made no effort to improve the method, but have 
simply followed more or less exactly and have described with slight varia- 
— the procedure in vogue in Professor EycLESHYMER’S classes at the 
U niversity of Chicago since 1893. Consequently, Mr. PLowMAN is mis- 
taken _ assigning my account so high a rank as second hand, when in 
reality it is an accumulation so old that it cannot claim to be anything more 
= an ordinary text-book account, culled from older text-book accounts. 
ndeed, the use of hydrofluoric acid is the only essential addition by Mr. 
PLOWMAN to the long used celloidin methods. —CHARLES J. CHAMBERLAIN. 
