330 DOCTOR COLDEN [1745. 



my memory do not fail me, I shall try this with galls, and Sal 

 Ammoniac. 



My son tells me, that upon a survey in the Mohawk's River, 

 they met with a spring which let fall considerable quantities of 

 sulphur ; and that the Indians who were with him filled their kegs 

 with the water of this spring, to carry home for the use of some 

 that were sick. It is not a hot spring. I have never heard of 

 any hot springs in this country. Colonel Morris, I remember, 

 several years since told me of a very good chalybeate spring, in 

 Monmouth County, in East Jersey: and this is all the information 

 I can give you, on this subject. I forgot to mention the spring in 

 the Onondaga country, which, perhaps, you saw when you were 

 there, which throws up a kind of Naphtha, or Petroleum, or Bar- 

 badoes Tar. 



Mr. Collinson wrote to me, that he had directed my brother's 

 letter to your care, and from thence I concluded that it was put 

 up among your papers. I have received a letter from my brother 

 since the date of that, which makes the loss of it of no conse- 

 quence. I thank you for the piece of news, of the Russian Expe- 

 dition to America, which is well worth tbe notice of Great Britain ; 

 as likewise for the seeds of Saururus, and Stargrass. 



I inclose a few seeds of the Arbor vitaz. When at my son's, in 

 the end of September, I found the seed ripe, and gathered a little; 

 but being obliged to return home speedily, I resolved to send my 

 son John to gather more, who was then with me. Something 

 made me delay it for five or six days ; and when he came, the 

 seed were everywhere fallen. I little suspected its being so soon 

 gone, otherwise I should have taken care to have got you enough 

 to send to your correspondents. 



As to your Philosophical Society, I can say nothing but that, as 

 it is certain that some have been too lazy, so others may have been 

 too officious ; which makes the more prudent afraid of them. 



Doctor Mitchell writes to me, that he has sent you some ac- 

 count of the Virginia Pines. I should be glad to see anything 

 that comes from that curious and learned gentleman. 



I heartily wish you and yours all health and prosperity ; and am 

 your affectionate friend and servant, 



CADWALLADER COLIkEN. 



Since I wrote this, I received by way of London, Doctor Gro- 



