516 Scientific Intelligence, [April, 



To find the value of the last term, the first member must be 

 squared, the second member must be multiplied into the square, 

 and the sign of the square root prefixed to the result. Thus, 



- 2 + 6 ^/ - 3 



- 2 + 6 V - '6 



784 



And prefixing the sign it becomes */ 784 = 28, which added to 

 36 found before gives 64. 



I am. Sir, your obedient servant, 



Tubney Park, March 5, 1815. JamKS LoCKHART. 



VIII. On ike Use of the Cerelellum and Spinal Marrow. 



(To Dr, Thomson.) 

 SIR, London, Feb. 14, 1815. 



In the 26th Number of your Journal is announced a discovery of 

 the use of the cerebellum and structure of the spinal marrow, by 

 Dr. John Cross of Glasgow. The following are the words of this 

 announcement: 



" I was led about a year ago to conclude, that as the cerebrum is 

 the fountain of sensation and intellect, the cerebellum must be the 

 organ which supplies with nervous energy the face and other parts 

 of the head, extrinsical of the brain, &c." Again, " I found that 

 the spinal marrow is uniformly composed of four longitudinal divi- 

 sions ; two larger, anterior, which may be traced into the cerebrum, 

 and two smaller, posterior, which may be traced into the cere- 

 bellum. I suppose that the two anterior portions are the organ of 

 feeling J the two posterior, of motion." 



Now, Sir, this, though more vaguely stated, is so closely imi- 

 tative of a statement which 1 actually published nearly six years 

 ago, (in Archives of Universal Science, vol. iii. for July, IHOy,) 

 that I am compelled to beg you will do me the justice to point it 

 out. The following is that statement. 



" From the pecuhar opposition which subsists between the situa- 

 tion of the face and cerebellum, we are entitled to expect a similar 

 opposition in their functions. As the face, therefore, occupied by 

 the chief organs of sense, is the seat of sensation, so we might 

 expect the cerebellum to be the organ of volition. This supposition 

 receives additional force from the consideration that, as the organs 



