June 13, 1902.] 



SCIENCE. 



937 



tire equipment is that it is not intended 

 for investigation (othex* than pedagogical), 

 but for the instruction of undergraduate 



structed. As now finished, the enlarged 

 plant house provides the college with the 

 most essential part of a material botanical 



Fig. 6. View in tlie Greenhouse, looking toward the Laboratory. 



students. This is in accord with the policy 

 of the trustees of Smith College, which aims 

 not to develop university work, but to con- 

 centrate all effort upon the undergraduate 

 course. This course in plant physiology 

 is taken each year by twelve students, 

 seniors who must previously have had at 

 least two years of botanical study; they 

 work through the course described in the 

 present writer's book, 'A Laboratory 

 Course in Plant Physiology.' 



The Lyman Plant House was a gift to 

 Smith College from the late Mr. B. H. R. 

 Lyman, of Northampton and Brooklyn, 

 N. Y., in memory of his mother. The new 

 addition to this most appropriate and ser- 

 viceable memorial is the gift of Mr. Ly- 

 man's son, Mr. Frank Lyman, and his 

 daughter, Mrs. Alfred T. White, and her 

 husband. The details of construction have 

 received the close personal attention and 

 the very generous interest of Mr. W. A. 

 Burnham, of the firm of Lord and Burn- 

 ham, of New York, by whom the additions, 

 as well as the original range, have been eon- 



equipment of unsurpassed completeness 

 and excellence. 



W. F. Ganong. 



AN ELECTRIC LAMP FOR MICROSCOPE 

 ILLVMINATION. 



The chief desiderata for a microscope 

 lamp are brilliancy and whiteness of light 

 and an evenly illuminated surface of con- 

 siderable extent from which to take the 

 light. In planning eight years ago for the 

 illumination of our biological laboratory at 

 the Woman's College of Baltimore, we 

 took into consideration Welsbach lamps 

 and incandescent electric lamps, deciding 

 on the latter. The ordinary incandescent 

 bulb is too small to serve unmodified as the 

 source of light for microscope illumination, 

 and its light is too yellow. These difficul- 

 ties, however, we have overcome with a fair 

 degree of success by the adoption of two 

 simple devices. Nearly white light is ob- 

 tained by using forty-volt lamps on our 

 fifty-volt current. This gives much more 

 perfect incandescence than is obtained 



