THE PROGRESS OF SCIENCE 



101 



logical method; and one feels that he 

 kept hoping against hope that some 

 cine would yet be found to lead him 

 triumphantly out of his labyrinth of 

 difficulties. So he held fast to his plan 

 of research, undismayed when his fel- 

 low workers deserted him. " The prob- 

 lem is difficult, not dead," he is said 

 to have declared, when others entered 

 some new and attractive field — " and 

 it is in the difficulties of an old 

 problem that one learns, not in begin- 

 ning a new one." 



Dohrn suffered, there can be no 

 doubt, in noticing that as time went on 

 " the problems of the head " attracted 

 fewer workers. But such a man must 

 have realized, none the less, that this 

 was an inevitable result when new lines 

 of investigation are suddenly developed 

 and when the number of investigators 

 available for all fields is small. And 

 in his heart he must have felt that his 

 theme would always be given a high 

 place, even by those to whom it be- 

 came " unfashionable." On the other 

 hand if there was no general sympathy 

 for his embryological work there was 

 certainly no lack of appreciation of his 

 work for the Naples station. He lived 

 to see it in the position which he had 

 planned for it, and he took keen satis- 

 faction in seeing his son Reinhart in- 

 stalled as its executive. So he may 

 well have felt in the end, as the solace 

 of his long illness, that his work had 

 been well done. 



THE NON-MAGNETIC YACHT 

 " CARNEGIE " 



The Carnegie left Brooklyn, N. Y., 

 on August 21 last, to carry out her 

 first cruise, extending to St. John's 

 N. F., thence to England and returning 

 to New York, early next year, via 

 Madeira and Bermuda. As may be 

 recalled, this vessel has been built 

 practically without any iron, or other 

 magnetic materials, in order to adapt 

 her to the needs of a magnetic survey 

 of the oceans under the direction of the 

 Department of Terrestrial Magnetism 



of the Carnegie Institution of Wash- 

 ington. 



She arrived at St. John's on Sep- 

 tember 25 and left again on October 2 

 with the director, Dr. L. A. Bauer, on 

 board, accomplishing the passage across 

 the Atlantic to Falmouth, England, in 

 twelve days. She is now en route to 

 Madeira and Bermvida under the com- 

 mand of W. J. Peters. In addition to 

 the scientific and navigation staff, com- 

 posed of seven persons, there are on 

 board two watch officers, two cooks and 

 nine seamen, or twenty persons in all. 



The tests and observations made thus 

 far have proved that the desired non- 

 magnetic conditions where the various 

 instruments are placed have been actu- 

 ally secured, so that no corrections 

 whatsoever need be applied to the mag- 

 netic data obtained on the Carnegie. 

 In consequence the work has been 

 greatly facilitated and for the first 

 time it has become possible to make 

 known the results immediately upon 

 conclusion of a voyage. The instru- 

 ments, largely designed and constructed 

 in the workshop of Dr. Bauer's depart- 

 ment, have reached a high stage of per- 

 fection, permitting satisfactory observa- 

 tions to be made even under adverse 

 conditions of sea and weather. 



The introduction of sheltering ob- 

 servatories, circular in shape and hav- 

 ing revolvable domes similar to those 

 of astronomical observatories, is one of 

 the new features which has contributed 

 to the success achieved. Inside these 

 observatories, of which there are two, 

 the after one being shown in the view, 

 both astronomical and magnetic ob- 

 servations may be made with full pro- 

 tection to the observer and instrument 

 from wind and weather. 



During a period of six weeks the 

 work of this vessel has already dis- 

 closed errors in the magnetic data sup- 

 plied to mariners of sufficient practical 

 importance to require attention. Thus 

 it was found that from Long Island to 

 a point off St. John's the charts show 

 too small west magnetic declination by 



