38 TOPOGRAPHY 



mystery to us. The same may be said of the erysi- 

 pelas, which prevailed to so alarming an extent in 

 Gibraltar, soon after the cessation of the head 

 disease. 



Much yet remains to be learned from medical offi- 

 cers of the army, although medical science is already 

 indebted to the labours of Mr. Henry Marshall and 

 Major Tulloch, for bringing in a condensed form to 

 the notice of the profession and to the public the mass 

 of hospital facts collected under the admirable ar- 

 rangement of Sir James M c Grigor, the Director- 

 General of the Army Medical Department, whose 

 anxious wish to encourage researches in Natural 

 History, will also doubtless continue to be responded 

 to by the medical officers serving in the colonies. 



