559 



sics, psychology and other branches of knowledge to the elucidation 

 of the physiology of vision, and the thorough, searching, and many- 

 sided way in which the whole matter is handled. 



In an essay " On the Development of the Reproductive Organs," 

 which appeared a few years later*, Miiller traced the steps of that 

 process in the embryo of man and animals, detected the minute pri- 

 mordial filament (now known by his name) which gives rise to the 

 oviduct or Fallopian tube, and applied with much success the know- 

 ledge thus acquired to the elucidation of certain perplexing malforma- 

 tions which sometimes occur. Pursuing his researches into the intimate 

 structure and development of organs, he was able about the same 

 time to produce his treatise on the secreting glandsf. In this well- 

 known work the intimate structure of the organs in question is inves- 

 tigated in the varied conditions which it presents, from the lowest 

 animals to man, and from the embryonic to the perfect state ; and 

 one great result of this labour was to establish, on a wider and more 

 satisfactory basis, the true doctrine of the relation of the blood-vessels 

 and gland- ducts, as first correctly conceived by Malpighi. It was 

 also shown that the same kind of secretion might be yielded by 

 glands formed, as far as discoverable, on an entirely different type of 

 construction. It was at this time, also, that Miiller, almost simulta- 

 neously with Panizza of Pavia, made the discovery of the lymphatic 

 hearts in reptiles ; a discovery, which especially deserves notice on the 

 present occasion, inasmuch as it was communicated to this Society 

 and published in the " Philosophical Transactions $." 



When he settled in Berlin, Miiller' s first care, next to his pro- 

 fessorial duties, was the continuation and completion of his " Hand- 

 book of Physiology," commenced before he left Bonn. Appearing 

 in successive parts, the book was at length finished in 1840. 



To this important work, so well and favourably known to English 

 readers through the admirable translation of Dr. Baly, it is unne- 

 cessary here to make long reference. With defects of construction 

 which detract from its usefulness as a systematic guide to the student 

 of physiology, although, as a general treatise, unequal in scope to 



* Bildungsgeschichte der Genitalien. Dusseldorf. 1 830. 



t De glandularum secernentium structura penitiori earumque prim a forma- 

 tione, &c. Lipsia. 1830. 



Read Feb. 14, 1833. Phil. Trans. 1833, p. 89. 



