Cadwallader Colden with Peter Collinson, <$fc. 125 



thence. I have inquired of Mr. Bartram and others, to discover 

 this Maryland Ipecacuanha ; but can discover no roots under that 

 name but two, both of them taken notice of by Mr. Clayton 

 in Gronov. Flora Virgin. Neither of them can be the plant 

 substituted for Ipecacuanha ; because the one hardly works with 

 double the dose of the true Ipecacuanha, and the other (an Esula) 

 works violently with half the dose. You will oblige me by 

 describing the species of Apocyjium, substituted in place of 

 Ipecacuanha, as Sir Hans affirms, or whatever other American 

 plant it be. 



I have presumed, I am afraid, too far upon your time and pa- 

 tience ; but when I consider that I am grown old before I had 

 the good fortune of any acquaintance with yon, and that I can 

 have but few opportunities of continuing it, and that only for a 

 short time, I cannot forbear making the most I can of the oppor- 

 tunities granted me, and beg you will excuse, sir, * * * 



Mr. Collinson to Dr. Colden. 



London, April 26th, 1745. 



My Dear Friend- — I did not expect that I should have found 

 any leisure to answer your kind letter of the 8th of December 

 last ; but I will find time to thank you for the perusal of your 

 papers to Dr. Gronovius, which I read over and over, and was 

 much pleased with your reasons and objections ; [which] are of 

 such weight as must affect the Linnasan system, and prevent its 

 being universally received. Tournefort and Ray, in my judg- 

 ment, are much preferable. Take this in general. I wish I 

 could be more particular. I really wonder at your proficiency in 

 so short a time. I transmitted those papers by a safe hand to 

 Dr. Gronovius, who writes many curious remarks on the things 

 sent by J. Bartram, in distinct pages. Could you see them, they 

 would I am sure give you entertainment, and put you in a reg- 

 ular method for future enquiries in some matters. I really don't 

 know such another knowing, indefatigable man, as Doct. Gro- 

 novius. 



Your brother sent me a letter for you, complaining he had not 

 heard from you, which I enclosed early in the spring to J. Bar- 

 tram, by Capt. Bream, who I desired to forward it to you. 



I am glad to hear of the Philadelphia society. I certainly 

 think it cannot labor long when such wonders are all around 



