1916.] The Third Indian Science Congress. cxxiii 



alteration of monoclinic .pyroxenes into the rhombic forms. Before de 

 scribing a set of fine-grained rocks which show a peculiar micro^raphi 

 structure made up of sinuous blebs of augite-hypersthene and felspar 

 which ultimately alter and pass into garnet, it has been found desirable 



hyp 



augite- 



thus proving the direction of the change from augite to garnet and not 

 the other way by which the micrographic augite-felspar is considered a 

 being due to the destruction of garnets. The most peculiar structure is 

 the radial arrangement of the vermicular augite-hypersthene from a com- 

 mon centre which is sometimes occupied by garnet. Garnet grains are 

 often found in crystallographic continuity with hypersthene. In a speci- 

 men of nonte the centrical and irregular micrographic augite-felspar does 

 not proceed from garnet at all. but is observed to stretch out from hvpers- 

 thene to hypersthene. l 



The alteration of augite is shown below : 



Augite (monoclinic pyroxene) 

 I 



I I 



Hornblende (?) Clino-hypersthene 



(?) Garnet Hypersthene 



Garnet 



On the correlation of Augite-diorite and dolerite. — By Kiren 



K. Sen Gupta. 



The intrusive gabbro (augite-diorite) is typically developed in the 

 Cochin State. It is essentially holocrystalline and granitoid, but homo- 

 geneous rock, the constituent minerals felspar and augite being distinct. 

 From the microscopic characters it is reasonable to infer that these types 

 are the coarsely crystalline dolerites. This view is strengthened by other 

 evidence. At Thelikod Kunnu, north of Panamcheri village, there is an 

 exposure of the instrusive flanked on both sides by dolerite. They also 

 occur together at the foot of the hills (Tangal Kunnu) half a mile south- 

 west of the eighth milestone on the way from Trichur to Pattikad and 

 also at Xunnanchira. half a mile upstream from the Mudavarichal bridge. 

 The dolerites may be considered as the result of marginal cooling of 

 gabbro intrusives. But there are objections to this hypothesis as a 

 regular gradation in structure from the central mass of gabbro to the 

 marginal dolerite has not been observed so far in the rocks examined, and 

 as isolated intrusions of dolerite are of frequent occurrence. All the 

 exposures of gabbro and dolerite are found in parallel zones or belts run- 

 ning in a N.-W. S.-E. direction. They are thus closely related or are 

 separated bv a short interval of time. 



Ethnology Section. 

 Malabar Magic, — By L. K. Anantakrishna Iyer. 



Malabar, according to Mr. Iyer, is supposed to be the land of magic, 

 sorcery and witchcraft, and even now there are persons practising various 

 kinds of black art There was a very mischievous imp who was capable 

 of doing injury of all kinds if only set up by a sorcerer who had always 

 to feed him in a material sense. In the absence of this propitiation to 

 these imp.-, they were supposed to turn against the prompter and pro- 

 bably put him to death. Another interesting topic on this subject was, 

 what was known as Odi cult. It meant the breaking of a man's body by 

 some >pecial device. The adept in the art was supposed to possess two 



