E R R A T A. 
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Page. Line. 
249. 10. for “ laft to the” read “ laft term to ten times the” 
254. 25. for “ has” read “ have” 
301. 13. for “ alto” read “ altro” 
302. 9. for “ alto” read “ altro” 
305. 18. for “ celle” read “ celles” 
20. for “ at” rfflra? “ et” 
22. for “ cet” read 1 ' cette” 
330. 20. for “ was” read u were” 
336. 23. for “ LC” “ Lc” 
339. 14. for “ 2d” read“ 23d” 
■ laft line, for “ 13 13 52.4 ” read il 16 13 52.4” 
340. 8. for “ 15 h. 13' 5 2". 4” read “16 h. 13' 52".4 
416. 24. and 25. for “ we do know” read “ we do not know” 
429. 22. for a full flop after “ fenfe” put a comma 
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