EXPERIMENT STATION. 65 



talline so as to exclude moisture, hence frost has but little effect 

 iipon it. 



" Lime was burned here a great many years ago, and from Prof. 

 Forrest Shepherd, with whom I visited the locality, I learn that 

 the cement (made from this lime) having suffered eighty years' 

 exposure, still remains firm. 



" The limestone near Willimantic is underrated as to its extent 

 in the account given of it in the Station Report for 1881, pp. 58, 

 59. I have made several visits to the locality, and find the beds 

 much thicker than there reported. At one place there is a hori- 

 zontal surface of fifty feet exposed, and the layers have a dip of 

 twenty-two degrees, which would give us a bed of over eighteen 

 feet in thickness instead of three feet as stated. 



" The Norwich and North Stoniugton limestone beds are des- 

 tined to become of great value to the agricultural interests of eas- 

 tern Connecticut as a source of fertilizing material. The North, 

 Stonington deposits would also appear to have considerable value 

 for architectural purposes. 



Mansfield, Conn., Nov. 28th, 1883." 



Rock from a Ledge in New Canaan. 



With regard to this material, Edwin Hoyt, of New Canaan, 

 wrote as follows : 



"The stone came from a ledge on the land of one of our 

 farmers, which he has had ground in the past, and finds it to make 

 very green and luxuriant grass. * * * jjg gjj^yg jj grinds as 

 easily as plaster, and thinks it better as a fertilizer." 



The analysis is as follows : 



102T 



"Water at 100°, 2.15 



Obmbined water, 9.60 



Sand and undecomposed silicates, 16.19 



Silica from decomposable silicates, - 26.44 



Oxide of iron and alumina, 8.65 



Lime, - — 7.63 



« Magnesia, , 24.35 



Potash, .32 



Soda, _ trace 



Carbonic acid, 5.30 



Phosphoric acid, .04 



100.61 



