MEMOERE SUE LA TBIJJU DES UYSTERTN&ES. 407 



vious that this return of sensibility cannot be due to any cause con- 

 nected with the vessels of the partially amputated limb ; we must 

 attribute it rather to the increased vascularity of the spinal cord, 

 which must more or less extensively result from the injury done to 

 it. So also it would appear that, after division of a lateral half of the 

 spinal cord, the increased vascularity which unavoidably attends such 

 an experiment may be, in some degree, a cause of the hyperesthesia 

 already alluded to in a previous part of this article. 



In concluding the present imperfect notice of Dr. Brown-Sequard's 

 work, we wish merely to add that we have perused it with the greatest 

 possible pleasure ; and that wherever we have ventured to differ from 

 the learned author, we have tried to do so with all the respect due to 

 a man who has devoted much of his life to the successful investigation 

 of the truths of natural science, and who has, with extraordinary 

 industry and ability, sought to solve some of the most difficult 

 problems in Physiology, 



XLI. — Memoiee sue la teibu des Hysteeenees de la. eamille 

 des Hypoxyl£es (Pyeenomycetes), par M. le Pasteur Duby, 

 Docteur-es-Sciences. Geneve, Jules-Gine. Pick, 1861. 



This Memoir, now published separately, first appeared in the " Me- 

 moires de la Societe de Physique et d'Histoire naturelle de Geneve." 

 (Tome XYI.) It will be of great service to Mycologists, relating as 

 it does to a subject upon which a monograph was much wanted. 

 Monsieur Duby has for some time been occupied in preparing a 

 w T ork on the Hypoxyleae, or Pyrenomycetes, as Pries terms them, and 

 the present account of one of the most important tribes of that family 

 is published, by way of Proclromus to the larger work. 



After a few introductory remarks, the author divides his work 

 into four sections. The first contains some general observations on 

 the family of the Pyrenomycetes, and especially on the tribe of the 

 Hysterinea?. The second section relates to the particular characters 

 of the Hysterinese and the relative value of such characters. The 

 third section contains a systematic exposition of genera and species, 

 and the fourth, some remarks on the application to the family of the 

 Hypoxylea3 of the principles laid down in the previous part of the 

 work. 



The position of the Hysterinea? amongst the Pungi has given rise 

 to some difference of opinion. Pries in the " Systema Mycologicum" 

 placed them in the Pyrenomycetes, but in his later, work, the 

 " Summa Yegetabilium Scandinavia," he has transferred the greater 

 portion of the tribe to the neighbourhood of the Pezizas in the Dis- 

 comycetes. He retains, however, LopJiiicm, Actidium, and Gstropa 

 amongst the Pyrenomycetes, mainly upon the grounds that in these 

 three genera the perithecia never open, and that the spores only 

 vol. i. — N. h. e. 3 a 



