FOURTH REPORT OF THE DIRECTOR I907 39 



in a sparsely inhabited region, which accounts for the small damage 

 and loss of life that ensued. 



May 28. Slight trembling indicated on the north-south pen- 

 dulum, continuing at intervals until 5 p. m. 



May 31. Faint tremors of seismic nature. 



June I. Small disturbance, coincident with a slight shock in 

 Ecuador. 



June 4. A distant earthquake traced for over an hour on the 

 north-south pendulum. 



June 28. Small tremors. 



July I. This disturbance would seem to have been a severe 

 one, and perhaps 5000 miles distant in a southerly direction. The 

 Havana station reported its passage at 7.43 a. m. It was probably 

 submarine. 



August 17. A thickening of the line traced by the north-south 

 instrument, breaking into minute waves 20 minutes after the be- 

 ginning 



September 2. A very distant shock, 3S shown by the long 

 duration of the preliminary tremors and by the continuance of the 

 record for an interval of nearly four hours. Vibrations much more 

 pronounce:! on the north-south machine. The Isle of Wright sta- 

 tion reported its passage later than American stations so that it 

 undoubtedly came from the Pacific. 



September 23. Vibrations of small amplitude throughout. 



September 24. North-south pendulum showed a condition of 

 slight instability, due to a small earthquake. Disturbance recorded 

 at Washington. 



*^ MINERALOGY 



In the section of mineralogy, the research work has included an 

 investigation of the crystal fofms of the calcite from Rossie, St 

 Lawrence co., a study of the crystal forms and twinning habit of 

 the new occurrence of calcite from Sterlingbush, Lewis co.. an 1 a 

 study of the minerals from Newcomb, Essex co. The work on t'le 

 Rossie calcite which yielded two forms new to the species and ^ 2 

 which are new to the occurrence, has amply demonstrated ihc value 

 of detailed crystallographic study on a large number of specimens 

 from localities even as well known as this one. The work on the 

 Newcomb minerals, which is still in progress, has already yielded a 

 new form for arsenopyrile and three new forms for werneritc as 

 well as a ratio for th.e axial elements of the latter mineral very 

 close to that determined by vom Rath.' The tourmalin crystals 



^Pogg. Ann. 1863. p. 119-254, 263. 



