comparative method morri halle once point phonological system analyze two phoneme too seem clear two language relate reconstruction involve both set correspondence among word morpheme comparative grammar fact phonology two phoneme formal excersise real phonology too reconstruction refer validity unless language really relate case mix language unless relevant part relate formal possibility important follow extent show cannot assume ability write comparative grammar either necessary sufficient show language question relate ability write convincing comparative gramm r significant here same token language relatedness sjown establish convincing set correspodence between suitable set word morpheme language compare even concede harder general convince case comparative grammar case set correspondence since former seem include latter plus lot one yet show here anywhere else establish language relatedness write complete comparative grammar even meillet concede cannot even demand fragment grammar perfectly wellestablish family where either indeed cannot another matter and ultimately interest one significant amount grammatical comparison though whole grammar has offer nostratic theory likely though perhap yet establish amerind theory basically unsupport karl victor example perhap uninterest illich svitych propose write nostratic comparative grammar never much sapirpromise write one uto aztecan fail though fairness note sapir live another two decade wherea illich svitych die without even finish lexical morphemic comparison bulk evidence public domain nostratic criticism sapir course agree need write comparatve grammar uto aztecan order everybody able uto aztecan language relate need case nostratic and indeed age proto nostratic language seem unlkikely ever partial grammar 