528 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 59. 



Table 5. — Datolite. 



Comparison of measured angles with calculated angles for new forms observed on 

 datolite from Westfield, Massachusetts. Dana orientation. 



Measured. 



Letter. 



Miller. 



Quality. 



15. 25.1 



Very good. 



Poor 



Very good . 



Good 



Poor 



Very good . 



Fair 



Very good. 

 ....do 



Good 



....do.... 



Very poor. 



Good 



Poor 



....do.... 



....do.... 

 ....do.... 

 Good 



Poor 



Fair 



Very good. 



Good 



Poor 



do.... 



do.... 



....do.... 

 do 



do.... 



do.... 



do.... 



do.... 



Good 



do.... 



Very poor. 

 Very good. 

 Poor 



do.... 



do.... 



Very poor. 



Fair 



do.... 



Very poor. 



Poor 



Very poor. 

 Poor 



Good 



30 08 



00 



89 55 



89 56 



90 00 

 90 00 



28 51 



9 58 



9 08 



7 35 

 57 25 



48 30 



49 24 

 52 49 

 30 38 



52 27 



33 55 



61 45 



61 24 



57 44 



22 23 



21 51 



15 22 



15 14 



15 05 



8 06 

 7 25 



4 51 



71 41 



56 52 



28 26 



18 54 



19 14 



18 41 



49 01 



49 38 



42 32 



44 20 



39 25 



37 55 



25 03 



18 06 



41 25 

 36 52 



Calculated. 



89 27 



62 00 



38 25 



39 26 



68 55 

 44 09 



46 48 



80 13 



81 04 



83 18 



81 09 



69 13 



63 18 

 59 01 



82 36 



64 13 



84 51 

 69 12 



62 44 



69 01 



68 59 



61 25 



48 18 



30 06 



27 49 



22 42 



56 15 



58 50 



76 03 

 26 20 



70 35 



67 00 

 64 43 



69 41 

 75 41 



70 29 



83 45 



68 59 

 S3 48 



78 35 



34 54 



84 55 



22 23 



77 12 



85 47 



88 22 



30 35 



05 



90 00 



90 00 



90 00 



90 00 



27 50 



9 57 



9 06 



7 30 

 57 37 

 49 19 



49 49 



49 50 



30 37 



51 38 

 32 14 

 61 29 



61 30 



57 38 



21 25 



21 26 



14 36 



14 30 



14 28 



8 38 

 7 23 



4 25 



72 25 



57 28 



27 37 



19 15 



19 14 



17 24 



49 45 



49 45 



43 17 



43 23 



38 15 



38 13 



25 30 



46 26 



52 31 



50 46 

 41 33 



37 07 



90 00 



59 21 



38 41 



39 22 

 69 25 

 43 50 



47 02 



80 12 



81 01 



82 34 

 81 58 

 69 04 



63 00 



57 30 



SO 21 



63 52 



84 54 



69 20 



63 19 



68 58 



69 51 



61 07 



48 16 

 33 11 



29 16 



23 05 



56 53 



59 27 



76 34 

 27 36 



70 45 

 67 29 

 63 34 



69 24 



75 41 



69 03 



83 26 

 73 58 

 81 06 



78 19 



35 02 



84 49 



22 35 



77 29 



85 46 



88 27 



